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physfs/extras/physfshttpd.c

310 lines
8.0 KiB
C
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/*
* This is a quick and dirty HTTP server that uses PhysicsFS to retrieve
* files. It is not robust at all, probably buggy, and definitely poorly
* designed. It's just meant to show that it can be done.
*
* Basically, you compile this code, and run it:
* ./physfshttpd archive1.zip archive2.zip /path/to/a/real/dir etc...
*
* The files are appended in order to the PhysicsFS search path, and when
* a client request comes in, it looks for the file in said search path.
*
* My goal was to make this work in less than 300 lines of C, so again, it's
* not to be used for any serious purpose. Patches to make this application
* suck less will be readily and gratefully accepted.
*
* Command line I used to build this on Linux:
* gcc -Wall -Werror -g -o bin/physfshttpd extras/physfshttpd.c -lphysfs
*
* License: this code is public domain. I make no warranty that it is useful,
* correct, harmless, or environmentally safe.
*
* This particular file may be used however you like, including copying it
* verbatim into a closed-source project, exploiting it commercially, and
* removing any trace of my name from the source (although I hope you won't
* do that). I welcome enhancements and corrections to this file, but I do
* not require you to send me patches if you make changes. This code has
* NO WARRANTY.
*
* Unless otherwise stated, the rest of PhysicsFS falls under the zlib license.
* Please see LICENSE.txt in the root of the source tree.
*
* This file was written by Ryan C. Gordon. (icculus@icculus.org).
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <ctype.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#ifndef LACKING_SIGNALS
#include <signal.h>
#endif
#ifndef LACKING_PROTOENT
#include <netdb.h>
#endif
#include "physfs.h"
#define DEFAULT_PORTNUM 8080
typedef struct
{
int sock;
struct sockaddr *addr;
socklen_t addrlen;
} http_args;
static char *txt404 =
"HTTP/1.0 404 Not Found\n"
"Connection: close\n"
"Content-Type: text/html; charset=utf-8\n"
"\n"
"<html><head><title>404 Not Found</title></head>\n"
"<body>Can't find that.</body></html>\n\n";
static char *txt200 =
"HTTP/1.0 200 OK\n"
"Connection: close\n"
"Content-Type: text/plain; charset=utf-8\n"
"\n";
static int writeAll(const int fd, const void *buf, const size_t len)
{
return (write(fd, buf, len) == len);
} /* writeAll */
static void feed_file_http(const char *ipstr, int sock, const char *fname)
{
PHYSFS_File *in = PHYSFS_openRead(fname);
printf("%s: requested [%s].\n", ipstr, fname);
if (in == NULL)
{
printf("%s: Can't open [%s]: %s.\n",
ipstr, fname, PHYSFS_getLastError());
if (!writeAll(sock, txt404, strlen(txt404)))
printf("%s: Write error to socket.\n", ipstr);
return;
} /* if */
if (writeAll(sock, txt200, strlen(txt200)))
{
do
{
char buffer[1024];
PHYSFS_sint64 br = PHYSFS_readBytes(in, buffer, sizeof (buffer));
if (br == -1)
{
printf("%s: Read error: %s.\n", ipstr, PHYSFS_getLastError());
break;
} /* if */
else if (!writeAll(sock, buffer, (size_t) br))
{
printf("%s: Write error to socket.\n", ipstr);
break;
} /* else if */
} while (!PHYSFS_eof(in));
} /* if */
PHYSFS_close(in);
} /* feed_file_http */
static void *do_http(void *_args)
{
http_args *args = (http_args *) _args;
char ipstr[128];
char buffer[512];
char *ptr;
strncpy(ipstr, inet_ntoa(((struct sockaddr_in *) args->addr)->sin_addr),
sizeof (ipstr));
ipstr[sizeof (ipstr) - 1] = '\0';
printf("%s: connected.\n", ipstr);
read(args->sock, buffer, sizeof (buffer));
buffer[sizeof (buffer) - 1] = '\0';
ptr = strchr(buffer, '\n');
if (!ptr)
printf("%s: potentially bogus request.\n", ipstr);
else
{
*ptr = '\0';
ptr = strchr(buffer, '\r');
if (ptr != NULL)
*ptr = '\0';
if ((toupper(buffer[0]) == 'G') &&
(toupper(buffer[1]) == 'E') &&
(toupper(buffer[2]) == 'T') &&
(toupper(buffer[3]) == ' ') &&
(toupper(buffer[4]) == '/'))
{
ptr = strchr(buffer + 5, ' ');
if (ptr != NULL)
*ptr = '\0';
feed_file_http(ipstr, args->sock, buffer + 4);
} /* if */
} /* else */
/* !!! FIXME: Time the transfer. */
printf("%s: closing connection.\n", ipstr);
close(args->sock);
free(args->addr);
free(args);
return NULL;
} /* do_http */
static void serve_http_request(int sock, struct sockaddr *addr,
socklen_t addrlen)
{
http_args *args = (http_args *) malloc(sizeof (http_args));
if (args == NULL)
{
printf("out of memory.\n");
return;
} /* if */
args->addr = (struct sockaddr *) malloc(addrlen);
if (args->addr == NULL)
{
free(args);
printf("out of memory.\n");
return;
} /* if */
args->sock = sock;
args->addrlen = addrlen;
memcpy(args->addr, addr, addrlen);
/* !!! FIXME: optionally spin a thread... */
do_http((void *) args);
} /* server_http_request */
static int create_listen_socket(short portnum)
{
int retval = -1;
int protocol = 0; /* pray this is right. */
#ifndef LACKING_PROTOENT
struct protoent *prot;
setprotoent(0);
prot = getprotobyname("tcp");
if (prot != NULL)
protocol = prot->p_proto;
#endif
retval = socket(PF_INET, SOCK_STREAM, protocol);
if (retval >= 0)
{
struct sockaddr_in addr;
addr.sin_family = AF_INET;
addr.sin_port = htons(portnum);
addr.sin_addr.s_addr = INADDR_ANY;
if ((bind(retval, (struct sockaddr *) &addr, (socklen_t) sizeof (addr)) == -1) ||
(listen(retval, 5) == -1))
{
close(retval);
retval = -1;
} /* if */
} /* if */
return retval;
} /* create_listen_socket */
static int listensocket = -1;
void at_exit_cleanup(void)
{
/*
* !!! FIXME: If thread support, signal threads to terminate and
* !!! FIXME: wait for them to clean up.
*/
if (listensocket >= 0)
close(listensocket);
if (!PHYSFS_deinit())
printf("PHYSFS_deinit() failed: %s\n", PHYSFS_getLastError());
} /* at_exit_cleanup */
int main(int argc, char **argv)
{
int i;
int portnum = DEFAULT_PORTNUM;
setbuf(stdout, NULL);
setbuf(stderr, NULL);
#ifndef LACKING_SIGNALS
/* I'm not sure if this qualifies as a cheap trick... */
signal(SIGTERM, exit);
signal(SIGINT, exit);
signal(SIGFPE, exit);
signal(SIGSEGV, exit);
signal(SIGPIPE, exit);
signal(SIGILL, exit);
#endif
if (argc == 1)
{
printf("USAGE: %s <archive1> [archive2 [... archiveN]]\n", argv[0]);
return 42;
} /* if */
if (!PHYSFS_init(argv[0]))
{
printf("PHYSFS_init() failed: %s\n", PHYSFS_getLastError());
return 42;
} /* if */
/* normally, this is bad practice, but oh well. */
atexit(at_exit_cleanup);
for (i = 1; i < argc; i++)
{
if (!PHYSFS_mount(argv[i], NULL, 1))
printf(" WARNING: failed to add [%s] to search path.\n", argv[i]);
} /* else */
listensocket = create_listen_socket(portnum);
if (listensocket < 0)
{
printf("listen socket failed to create.\n");
return 42;
} /* if */
while (1) /* infinite loop for now. */
{
struct sockaddr addr;
socklen_t len;
int s = accept(listensocket, &addr, &len);
if (s < 0)
{
printf("accept() failed: %s\n", strerror(errno));
close(listensocket);
return 42;
} /* if */
serve_http_request(s, &addr, len);
} /* while */
return 0;
} /* main */
/* end of physfshttpd.c ... */
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